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If you use WordPress and found a base64 string on your theme you may be right to be alarmed but only if it’s found on .php files as this string might be a code to manipulate data on your site. However, a base64 string found on the style.css or any stylesheet file is usually just an embedded image using the URI format. This is normally done to lessen http requests and make the theme load faster.

The Asteroid Theme for WordPress actually has a couple of these images embedded on the style.css. So don’t be alarmed as these are only images.

Here’s a sample that you may see on the Asteroid Theme:

background-image: url(“data:image/png;base64,iVBORw0KGgoAAAAN…

Copy the full string below and use this site to decode the string. Then rename the resulting file with a .png to see the complete image.